66776517611 has 8 divisors (see below), whose sum is σ = 66969645600. Its totient is φ = 66583500480.

The previous prime is 66776517601. The next prime is 66776517617. The reversal of 66776517611 is 11671567766.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66776517611 - 2²² = 66772323307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66776517617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1265231 + ... + 1316951.

It is an arithmetic number, because the mean of its divisors is an integer number (8371205700).

Almost surely, 2^66776517611 is an apocalyptic number.

66776517611 is a deficient number, since it is larger than the sum of its proper divisors (193127989).

66776517611 is a wasteful number, since it uses less digits than its factorization.

66776517611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55429.

The product of its digits is 2222640, while the sum is 53.

The spelling of 66776517611 in words is "sixty-six billion, seven hundred seventy-six million, five hundred seventeen thousand, six hundred eleven".